Quick Answer
Large jQuery app best practices: modular file structure (one feature per file), use $.extend for namespaced global config, avoid global variables (use IIFE modules or ES6 modules), document all public plugin APIs, write unit tests with QUnit or Jest + jsdom, use linting (ESLint), and consider migrating incrementally to vanilla JS or a framework for new features.
Answer
Modularize code using plugins or IIFE. Use namespaced events and selector caching. Optimize animations, DOM access, and AJAX. Refactor regularly and combine with modern JS.
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SugharaIQ Editorial Team
Verified Answer
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